U.S. Sen. Jack Reed, D-R.I., went to CIA headquarters in Langley, Virginia, on Monday morning to view the binders full of classified material that led the intelligence community to conclude that Russia sought to sway the 2016 election in favor of Donald Trump.

His own takeaway after viewing the documents: "It confirms what the intelligence community have said publicly, that the Russians at the order of [Vladimir] Putin deliberately involved themselves in the campaign to undermine the candidacy of [former Secretary of State Hillary] Clinton.

"They did it by hacking. They did it by disinformation. They did by operating troll networks in Moscow that [were] continually circulating false news on the internet. It was a comprehensive and high-level campaign that was focused on disrupting our election."

Asked what in the documents needs to remain secret, Reed said: "Their conclusions are based on sources. Individual, different ways they gather intelligence and the methods of gathering intelligence ... that they do not want to disclose."

In another venue on Monday, FBI director James Comey told a congressional committee there is no evidence that President Trump and his campaign was wiretapped, "particularly directed" by then-President Barack Obama, as Trump has alleged. Reed said that would not normally be under the purview of the CIA, since the agency is by law required to operate outside the country.

Reed said he went to the CIA headquarters in his role as the ranking member of the Senate Armed Services Committee, which gives him a non-voting "ex officio" role on the Senate committee probing the Kremlin's activities, "including both what the Russians did and what others might have done to help them. ... One of the first steps is to review material that the intelligence community has collected."

Asked who the "others" might be, Reed said, they potentially include "Americans or people in the United States conducting activities here that are subject to our criminal laws."

"According to Director Comey this morning," Reed said, the FBI "is conducting a criminal investigation that touch[es] upon the relationship or alleged relationship between the Trump campaign and Russian inference."

"To the extent the Trump campaign was involved, those questions are being addressed now directly by the FBI."

Any direct lines to Trump?

"I can't get into any of the details other than what has been publicly released by the intelligence agencies."

"Given what they've done in 2016, we have to be prepared for 2018 and beyond," he said of the Russians.